There is no such requirement as 2 year unemployment will be treated as not elligible to apply. You or your wife should have at least 1 year of continuous employment in last 10 year.
Thanks to this forum, been a silent spectator. Just received email to submit our passports. AOR- Dec 16th 2018 (outland FSW).& ghost update yesterday (& IP2 Feb 22nd 2019 & Addtnl document request on Jan 23rd 2019). All the best to everyone.